Analysis of well-seismic stratigraphic correlation and establishment of regional stratigraphic framework in the Qiongdongnan Basin of northern South China Sea

Chen Hongyan; Sun Zhipeng; Zhai Shikui; Liu Xinyu; Liu Xiaofeng; Luo Wei; Xiu Chun

doi:10.3969/j.issn.0253-4193.2015.05.001

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Chen Hongyan, Sun Zhipeng, Zhai Shikui, Liu Xinyu, Liu Xiaofeng, Luo Wei, Xiu Chun. Analysis of well-seismic stratigraphic correlation and establishment of regional stratigraphic framework in the Qiongdongnan Basin of northern South China Sea[J]. Haiyang Xuebao, 2015, 37(5): 1-14. doi: 10.3969/j.issn.0253-4193.2015.05.001

Citation:

Chen Hongyan, Sun Zhipeng, Zhai Shikui, Liu Xinyu, Liu Xiaofeng, Luo Wei, Xiu Chun. Analysis of well-seismic stratigraphic correlation and establishment of regional stratigraphic framework in the Qiongdongnan Basin of northern South China Sea[J]. Haiyang Xuebao, 2015, 37(5): 1-14. doi: 10.3969/j.issn.0253-4193.2015.05.001

Citation:

Chen Hongyan, Sun Zhipeng, Zhai Shikui, Liu Xinyu, Liu Xiaofeng, Luo Wei, Xiu Chun. Analysis of well-seismic stratigraphic correlation and establishment of regional stratigraphic framework in the Qiongdongnan Basin of northern South China Sea[J]. Haiyang Xuebao, 2015, 37(5): 1-14. doi: 10.3969/j.issn.0253-4193.2015.05.001

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Analysis of well-seismic stratigraphic correlation and establishment of regional stratigraphic framework in the Qiongdongnan Basin of northern South China Sea

doi: 10.3969/j.issn.0253-4193.2015.05.001

1.
The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
Zhanjiang Branch Institute of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China

Received Date: 2014-12-28
Rev Recd Date: 2015-02-06

Abstract

Abstract

The Qiongdongnan Basin experienced a series of tectonic activities from faulting,through fault-depression and post-faulting thermal subsidence to post-faulting accelerated subsidence,had a sedimentary environment from coast in Eocene to deep-sea in present,formed a set of strata combination including littoral sediments,offshore sediments,shelf-slope sediments and bathyal sediments,and possessed favorable source-reservoir-cap conditions for hydrocarbon accumulation. Thus it is considered as an important region of hydrocarbon exploration and development. In this study,the key strata interfaces (T20,T30,T40,T50,T60 and T70) in the wells-through seismic profiles were identified,then were tracked and correlated combined with the regional wells-tie seismic profiles in the basin. On this basis,the regional stratigraphic framework of the Qiongdongnan Basin was established associated with the age of fossil assemblages. The Neogene strata (T60-T20) are primary in the shallow water area,in which the faults are rarely distributed,the stratigraphic thickness has little variation,and onlaps and truncations can be rarely found. Delta sedimentary system,which is beneficial to hydrocarbon reservoir,develops highly in local area. The evidence mentioned above indicates that tectonism exerted trivial influence on the Qiongdongnan Basin during the Neogene. The characteristics of the Neogene strata (T60-T20) in the deep water area are similar to that in the shallow water except seismic reflection characteristics. The internal sequence structure of the Paleogene strata (T100-T60) is dominantly sphenoid or subparallel with obvious onlaps and truncations. The thickness of the strata is large,and obvious faults result in strata fractures. These characteristics imply that the deep water area in the Qiongdongnan Basin was controlled mainly by tectonism,accompanying with the strong extension and rapid subsidence,and being in neritic environment during the Paleogene. Three stages of sand bodies are identified in the Central Canyon from east to west: the first stage (depth of 3 528-3 336 m,thickness of about 192 m) formed during 11.6-5.5Ma B.P. (T40-T30) distributes in the Lingshui-Songnan-Baodao segment of the Central Canyon,which includes turbidite channel deposit,turbidite sheet sand,mass flow deposit,deep-sea politic deposit,natural levee and overflow deposit; the second stage (depth of 4 100-3 900 m,thickness of about 200 m) formed during 5.5~4.2Ma B.P. (T30-T29),spans Ledong-Lingshui segment of the Central Canyon,being primarily composed of gravity flow deposits; the third stage(depth of 3 630-3 400 m,thickness of about 230 m) formed during 4.2-3.6Ma B.P. (T29-T28),presents in the Ledong-Yingdong segment of the Central Canyon,consisting mainly of turbidite channel deposits. The three stages of sand bodies from oldest in the east to youngest in the west,constituted the favorable reservoirs in the Central Depression Belt of the Qiongdongnan Basin.

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